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Ultra small ‘green’ 2A buck regulator is ideal replacement for inefficient LDOs

“LDO Killers” help developers meet ‘Energy Star’ requirements and deliver power densities of 70W/inch

Now available from UR Group, the Enpirion EN5322QI is a 2A buck-mode converter that combines industry’s highest power density with low noise operation. Featuring proprietary integrated inductor technology, EN5322QI delivers high-performance while simplifying design and reducing part count.

The EN5322QI’s tiny footprint and ease of design make it a near drop-in replacement for inefficient linear converters. The part comes in a tiny 6mm x 4mm x 1.1mm QFN package and integrates all converter functionality, while requiring only a single input and single output ceramic filter capacitor. The converter integrates MOSFET switches, control and compensation, and the inductor, all in a tiny, low profile package. The device has a wide 2.4V to 5.5V input range and has a VID programmable output range from 0.6V to 3.3V. The EN5322QI is capable of sourcing a continuous 2A over the entire industrial temperature range.

Dubbed the “LDO Killer,” this device is the perfect replacement for linear regulators unable to meet Energy Star requirements. With the recent introduction of EPA Energy Star 4.0, development of Energy Star certified products need to meet new, stricter design requirements making it almost impossible to use linear converters. The Enpirion part solves the noise, size, cost and other historical challenges associated with the use of switchers, paving the way for across-the-board replacement of inherently inefficient LDOs (Low Drop Out regulators).

With a total solution footprint of less than 60 square millimetres (60mm²), the EN5322QI delivers a power density of more than 70 watts per square inch, giving it one of the highest power densities of any switch-mode DC-DC converter ever made. Power density is ever more important as the number of features and functions increase, while equipment form-factor continues to shrink.

The EN5322QI uses a type III voltage mode control scheme. As a result of the very high switching frequency, the EN5322QI has superior transient performance and the control scheme provides excellent load matching to the sub 90nm loads such as advanced processors, FPGAs, and complex ASICs.

The device joins the 1A and 3A devices and is already sampling for designs including computer peripherals, servers, wireless modems, portable devices, POS and datacoms.

For more information, call UR Group on 01793 826600.